Accumulator, I was sceptical at first so waited for months. Then I presented the idea and product to a friend of mine who said he would pay me to do it and try it out. I did and couldn't believe how easy it was to apply it. Prepping is the part that people need to worry about and make sure the vehicle is dust and oil free. I used an ipa wipe down even though if you use all Optimum Products, which I did and do, you don't have to ipa and just use water and power clean. Now I just wash the vehicle by pre soaking in car wash shampoo then a good cleaning with some power clean in the wash bucket. I do the jambs and everything. I then dry it and blow out all cracks and jambs then one quick wipe down with microfiber towel and start applying. I pre wipe each panel in case of dust, apply as stated on the directions and lightly wipe the panel for high spots and so on. I coat everything just about, even the exhaust tips, plastic and glass.
If there needs to be spot repair after 30 days, say on the hood, then wash the car, clay bar and polish the hood, ipa or power clean mixture, dry and apply new coat. Pretty simple and so far from personal experience its great and my customers love it.
Sorry, I didnt mean to turn this into a "how to apply Opti Guard" thread, just explaining how easy it is.to use.